Re: WM_DEVICECHANGE PARAMETERS

Hi,
Thanks, I'll try that first thing tomorrow.

I assume you mean this is done by calling the register function multiple
times with differrent GUIDS, and I assume that the resulting WM_DEVICECHANGE
will have usefull info then ? (if I register for "all classes" I just get
class guids, but if I register for keyboard I should get the keyboard guid in
the response ?) , Right ?

Do you happen to know where I can find the devicename of the inserted device
?
I did see a sample where some long , very cryptic devicename was retrieved,
but not the short form like KBD1:,COM1: etc...

Greetings,
Rob.





"Doron Holan [MSFT]" wrote:

yes, of course you can register for multiple notifications. for keyboards
you should GUID_DEVINTERFACE_KEYBOARD, not the HID guid.

d
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"Rob" <Rob@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:0153784F-2B33-43C4-B915-C121014F7BE5@xxxxxxxxxxxxxxxx
Hi,
I need to monitor several types of devices at the same time :
- keyboard (not all HID's)
- Comports
- Disks

Can I register multiple times for this ?

Greetings,
Rob.


"Doron Holan [MSFT]" wrote:

you need to register with a specific device interface. this tells you
the
type of device. once you have the devicce instance path on the arrival
notification you can use setupdi to open up the properties for the device
and read the "ComPort" property (for a COM port)

d

--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no
rights.


"Rob" <Rob@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:A51D55EF-F958-40F2-920C-1AD0DB3D73A8@xxxxxxxxxxxxxxxx
Hi,
I also had the problem that LParam is 0.
See codefragment below for the right (?) way to register, in order to
solve
that.

My problem is that when I plug in a device (like a COMPORT) I would
like
to
know 2 things :
1) WHat kind of device was plugged (comport, I need the IF-GUID I
think)
2) What it's devicename is (Like COM1:)

This seems impossible without to determine from the notification-info.
See : http://69.10.233.10/KB/cs/HardwareHelper.aspx
and :
http://www.codeproject.com/KB/system/HwDetect.aspx?display=PrintAll

monitoring the entire devicelist seems the only option.
I hope I'm wrong about this.

Any tips ?


//****** CODE fragment: ******

DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
GUID tmp={0,0,0,""};
ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );

NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
NotificationFilter.dbcc_classguid = tmp;

m_hDevNotify = RegisterDeviceNotification(m_hWnd
,&NotificationFilter,
DEVICE_NOTIFY_WINDOW_HANDLE|DEVICE_NOTIFY_ALL_INTERFACE_CLASSES);

//****** end CODE fragment: ******



Greetings,
Rob.




"rseedle" wrote:

I am recieving the plug in / unplug events correctly but the WPARAM
always
has a 7 in it. If I understand correctly the WPARAM should specify the
values

DBT_DEVICEARRIVAL 0x8000
and
DBT_DEVICEREMOVECOMPLETE 0x8004

What is up with that ?

Randy Seedle




.

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